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Gameduino is a DIY, Open Source Game Platform Built on Arduino That's Ridiculously Awesome

"Gameduino is a DIY game platform built on a shield for the
Arduino. It's open source hardware (BSD and, for the code, GPL).
Okay, that's fairly cool. But what makes this project special is
that this inexpensive board (a $50 donation buys you one) has
hardware that's capable enough to be interesting, as seen in the
video.